update

engine/tests/fixtures/demo_sort.py

@@ -0,0 +1,27 @@
+"""Demo script for users: contains several detectable anti-patterns.
+
+- membership test against a list inside a loop  -> membership_in_list
+- nested loops                                  -> nested_loops
+- string concatenation with += inside a loop    -> str_concat_loop
+"""
+
+
+def build_report(rows, allow):
+    out = ""
+    for r in rows:
+        if r in allow:            # O(n) membership test on a list
+            out += str(r) + ","   # string += accumulation
+        for other in rows:        # nested loop -> O(n^2)
+            if r == other:
+                pass
+    return out
+
+
+def main():
+    rows = list(range(400))
+    allow = list(range(0, 400, 2))
+    for _ in range(30):
+        build_report(rows, allow)
+
+
+main()